Which are your steps to launch a PPC campaign (Of a product with 0 Reviews and high rank)?

I usually start with few broad keywords first week , next use positive terms to make phrase and the 3rd week use terms of the phrase to do exact keywords campaigns .

And product campaigns , i usually begin by targeting entire categories rather than individual products. I compete with products that have at least three reviews and a higher price point than mine.

I would suggest you to review the PPC help guides posted by @Reneewu, such as: